Delhi Police had slapped charges against Farman, Sunder, Pawan and Sunny Uppal under section 302 (murder) of IPC after the postmortem report revealed that Nido Taniam died due to injuries to his head and face caused by a blunt object.
However, in its charge sheet filed today before Chief Metropolitan Court here, CBI has alleged seven persons, including three juveniles, were involved in the assault on Tania and imposed charges of culpable homicide, illegal confinement and offences under the SC/ST Atrocities Act against the four.
The proceedings against the three juveniles will be carried out by the Juvenile Justice Board, the agency said.
Justifying the dilution of charges, CBI sources said the killing was triggered by an altercation over the breaking of counter and the accused had not planned it.
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They said the accused had not intended to kill Nido resulting in dropping of murder charges.
The sources said no weapon used in the attack was found other than a stick.
Son of Congress MLA Nido Pavibtra from Arunachal Pradesh, Tania, a BA first year student in a private university, had an altercation with some shopkeepers at Lajpat Nagar here on January 29 this year after they made fun of his hairstyle, following which they allegedly thrashed him.